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Engine fitment

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21 May 2024 08:46 #899455 by Formula264
Engine fitment was created by Formula264
Ok, I may be jumping the gun on my build. I purchased a 1981 J model 1000 for my 1978 KZ 1000 frame, it doesn't look like it will work to me. Any thoughts or advice?

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21 May 2024 09:04 #899456 by Wookie58

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21 May 2024 11:58 #899465 by Formula264
Replied by Formula264 on topic Engine fitment
Being a novice at bike building...after some more thought and measures it looks like it will be okay. Does PDM on here still do business? I tried contacting but haven't gotten a response yet.

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21 May 2024 12:13 - 21 May 2024 12:43 #899468 by Wookie58
Replied by Wookie58 on topic Engine fitment
I would think Zed1015 would be your best source of advice

Ref PDM Les Holt hasn't been on the forum for a good while but that doesn't mean he ain't working, StreetfighterKZ I believe you know Les well, is he still taking work on ??
Last edit: 21 May 2024 12:43 by Wookie58.
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  • DOHC
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21 May 2024 14:01 #899477 by DOHC
Replied by DOHC on topic Engine fitment

Why do you think it won't work ?
 

My impression is that with the introduction of the "J" motor in 1981 the motor mounts were changed to add rubber dampers. I've never tried to do this swap, but I'm guessing it's not a direct bolt-in swap.

As far as I know, all of the "big four" engines (Z1, kz900/1000) made from 1973 to 1980 use the same motor mounts and should bolt directly into any frame from 1973 to 1980.

Swapping across that 1980/1981 dividing line is where things get more complicated. Someone else will have to chime in with how complicated.

'78 Z1-R in blue , '78 Z1-R in black, '78 Z1-R in pieces
My dad's '74 Z1
'00 ZRX1100

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21 May 2024 15:19 - 22 May 2024 02:38 #899480 by zed1015
Replied by zed1015 on topic Engine fitment
The J/GPZ motor into the earlier frame has been done tons of times.
Upper rear mount is the same location as is the upper front.
Upper front mount will need spacers as it is narrower ( replace the rubber upper mounts inserts with solid aluminium bobbins )..
Once installed on those mounts you will see where the J engines lower front mounts differ from the Z frames lower mid mounts which will be redundant and where the new lower front mounts with a cross tube for the J need fabricating . 
It's been over 30 years since i did one of these as well as a GPZ1100 motor into a Z650 frame and it slips my mind whether the lower rear mount lines up too for the 1000 frame or whether it needs extending out to meet the engine. 

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Last edit: 22 May 2024 02:38 by zed1015.
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  • Scirocco
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21 May 2024 15:46 #899483 by Scirocco
Replied by Scirocco on topic Engine fitment
The 1000J and GPZ1000/1100 will fit but you have to made an extra engine mount to the frame for the engine case rubber damper.

 
 
 

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21 May 2024 16:02 #899486 by Formula264
Replied by Formula264 on topic Engine fitment
Good info guys thanks. I feel better about proceeding with this engine!

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21 May 2024 16:11 #899488 by Wookie58

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21 May 2024 17:01 #899494 by Formula264
Replied by Formula264 on topic Engine fitment

It's not a project without a bit of "fab" 
I've come to realize that and accepting.
 
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